Materials Science MCQ

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• Which of the following shows the best fracture strength?
  ক

  Zircon

  খ

  Macor

  গ

  Alumina

  ঘ

  There fracture strength are not comparable
• The largest constituent elements and flaws increase the flexural strength.
  ক

  True

  খ

  False
• For zircon for the same flaw size, the intensity factor is more than alumina.
  ক

  True

  খ

  False
• For edge flaws to occur which of the following should be the value of constant in stress intensity factor formula?
  ক

  1.1

  খ

  1.2

  গ

  1.02

  ঘ

  1.12
• Which of the following is a flexural strength not dependent on?
  ক

  Force

  খ

  Distance between supports

  গ

  Specimen width

  ঘ

  Length of specimen
• Which of the following is correct
  ক

  Aluminum oxide reaches fracture point before glass

  খ

  Aluminum oxide reaches fracture point after glass

  গ

  Aluminum oxide reaches fracture point at the same time as glass

  ঘ

  They do not reach a fracture point
• Silicon carbide is ductile.
  ক

  True

  খ

  False
• Which of the following can be the tensile strength of fused silica (SiO2)?
  ক

  110 MPa

  খ

  150 Mpa

  গ

  90 MPa

  ঘ

  80 MPa
• Which of the following can be the tensile strength of spinel?
  ক

  200 MPa

  খ

  300 Mpa

  গ

  100 MPa

  ঘ

  90 MPa
• Which of the following can be the tensile strength of aluminum oxide?
  ক

  600 MPa

  খ

  800 Mpa

  গ

  1000 MPa

  ঘ

  1200 MPa
• Which of the point is there in a stress strain curve for a ceramic?
  ক

  Ultimate tensile strength

  খ

  Fracture point

  গ

  Limit of proportionality

  ঘ

  Yield point
• What is shape of a stress strain curve for ceramics?
  ক

  Parabola

  খ

  Hyperbola

  গ

  Straight line

  ঘ

  Inverted parabola
• Which of the following test are done to find out the mechanical behavior of ceramics?
  ক

  Tensile test

  খ

  Compressive test

  গ

  Shearing test

  ঘ

  Transverse bending test
• Ceramics are brittle.
  ক

  True

  খ

  False
• Transition metal oxides are highly defective.
  ক

  True

  খ

  False
• Which of the following does point defect does not depend on?
  ক

  Density

  খ

  Melting point

  গ

  Hardness

  ঘ

  Optical absorb
• In which of the following the concentration of defect increases with temperature increase?
  ক

  Point defect

  খ

  Intrinsic defect

  গ

  Extrinsic defect

  ঘ

  Linear defect
• In which of the following the concentration of defect is constant?
  ক

  Point defect

  খ

  Intrinsic defect

  গ

  Extrinsic defect

  ঘ

  Linear defect
• In which of the following iron compounds, the compound is non-stoichiometric?
  ক

  Fe2+ and Fe3+

  খ

  Fe2+ ion only

  গ

  Fe3+ ion only

  ঘ

  It doesn’t depend on the iron ions
• Frenkel defects change the ratio of cation to anions.
  ক

  True

  খ

  False
• Schottky and Frenkel defects are __________
  ক

  interstitial and vacancy defects respectively

  খ

  vacancy and interstitial defect respectively

  গ

  interstitial defects

  ঘ

  vacancy defects
• The chemical composition of Buckminster Fullerene?
  ক

  C60

  খ

  C50

  গ

  C55

  ঘ

  C45
• Graphite is a good conductor of electricity.
  ক

  True

  খ

  False
• Which of the following can be used for lubrication?
  ক

  Graphite

  খ

  Diamond

  গ

  Brass

  ঘ

  Bronze
• Which of the following processes I not needed for making a synthetic diamond?
  ক

  Application of high temperature

  খ

  Application of high pressure

  গ

  Chemical vapor deposition

  ঘ

  Distillation
• What is a difference between carbon and ceramic?
  ক

  Both are hard

  খ

  Both are non metallic

  গ

  Both have covalent bonds

  ঘ

  Both have very high thermal conductivity
• Which of the following materials can be used as a substitute ceramic?
  ক

  Diamond

  খ

  Brass

  গ

  Bismuth

  ঘ

  Lead
• What kind of bonds are present in diamond?
  ক

  Covalent bond only

  খ

  Ionic bond only

  গ

  Mix of covalent and ionic bond

  ঘ

  Metallic bonds
• Carbon is a ceramic.
  ক

  True

  খ

  False
• Which of the following is not a component of steatite ceramic?
  ক

  Talc

  খ

  Clay

  গ

  Feldspar

  ঘ

  MgCO3